How can a person go ten days without sleeping?

I often appear when you have a cold and need a tissue. What am I? Solve the riddle → Water comes out of me. You use me when you wash your hands. What am I? Solve the riddle → I write and draw. The sharper I am, the better I work. What am I? Solve the riddle → I am very long and have many windows. I only travel on tracks and go 'choo-choo' when I arrive. Solve the riddle → What flies high up in the sky, is white, and sometimes turns gray when it's about to rain? Solve the riddle →